A thanathomancer device for gaining eternal life.
Thanks to Mike Mignola and Hellboy I have imagine this new artifact from that wonderfull thantomancer The Blood Countess: The Blood Counstess’ Iron Maiden (Wikipedia: iron maiden).
This iron maiden was the prefered killer machine of Elizabeth Báthory, her ritual killings were comitted with this torture device. She extracted the blood of their victims for bathing in it.
So continuous use of the iron maiden has ended embeding the thathomancer power in it, anyone sacrificing someone in this magical iron maiden receives the beneficts of “Stolen Life”, one year younger.
The devived was lost when Báthory was incercacelated and she, alive off course, is looking for her prefered toy.